// Std 8-bit unsigned integer: QI: Quarter Integer
typedef unsigned int __attribute__((__mode__(__QI__))) uint8;
// Std 16-bit unsigned integer: HI: Half Integer
typedef unsigned int __attribute__((__mode__(__HI__))) uint16;
// Std 32-bit single-precision floating-point: SF: Single Floating
typedef float        __attribute__((__mode__(__SF__))) flt32;

// Std 8-bit unsigned integer literal
inline constexpr uint8  operator ""  _ui8(unsigned long long int t_arg) noexcept{ return static_cast <uint8> ( t_arg ); }
// Std 16-bit unsigned integer literal
inline constexpr uint16 operator "" _ui16(unsigned long long int t_arg) noexcept{ return static_cast <uint16>( t_arg ); }
// Std 32-bit single-precision floating-point literal
inline constexpr flt32  operator ""_flt32(long double t_arg           ) noexcept{ return static_cast <flt32>( t_arg );  }

typedef enum : uint8 {
  P_BGRF_1  = 13_ui8,
  P_BGRF_2  = 12_ui8,
  P_BGRF_3  = 11_ui8,
  P_BGRF_4  = 10_ui8,
  P_BGRF_5  =  9_ui8,
  P_BGRF_6  =  8_ui8,
  P_BGRF_7  =  7_ui8,
  P_BGRF_8  =  6_ui8,
  P_BGRF_9  =  5_ui8,
  P_BGRF_10 =  4_ui8
// Enum used to assign and group the pin values of the bargraph
}e_PIN_BARGRAPH;

typedef enum : uint8 {
  P_BATT,
  P_CURR
// Enum used to assign and group the pin value of the ADC 
}e_PIN_ADC;

inline constexpr flt32 BOUNDARY_VOLTAGE_LEFT  = 0.0_flt32;
inline constexpr flt32 BOUNDARY_VOLTAGE_RIGHT = 5.0_flt32;
inline constexpr uint8 BOUNDARY_PERCENT_LEFT  =    0_ui8;
inline constexpr uint8 BOUNDARY_PERCENT_RIGHT  = 100_ui8;

// Function prototypes
uint8 compBatteryLevel(flt32 t_batt_voltage);
void ctrlBarGraph(const e_PIN_BARGRAPH t_bargraph_arr[], uint8 t_batt_percentage);
inline flt32 mapFlt(flt32 t_val, flt32 t_inMin, flt32 t_inMax, flt32 t_outMin, flt32 t_outMax);

// Global variables
const e_PIN_BARGRAPH arr_bargraph[] = {P_BGRF_1, P_BGRF_2, P_BGRF_3, P_BGRF_4, P_BGRF_5,
                                       P_BGRF_6, P_BGRF_7, P_BGRF_8, P_BGRF_9, P_BGRF_10};
flt32 batt_voltage    = 0.0_flt32;
uint8 batt_percentage = 0_ui8;

void setup() {
  // put your setup code here, to run once:
  pinMode(P_BGRF_1,  OUTPUT);
  pinMode(P_BGRF_2,  OUTPUT);
  pinMode(P_BGRF_3,  OUTPUT);
  pinMode(P_BGRF_4,  OUTPUT);
  pinMode(P_BGRF_5,  OUTPUT);
  pinMode(P_BGRF_6,  OUTPUT);
  pinMode(P_BGRF_7,  OUTPUT);
  pinMode(P_BGRF_8,  OUTPUT);
  pinMode(P_BGRF_9,  OUTPUT);
  pinMode(P_BGRF_10, OUTPUT);
  pinMode(P_BATT, INPUT);

  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  batt_voltage = analogRead(P_BATT);
  batt_voltage /= 1024;
  batt_voltage *= 5;

  batt_percentage = compBatteryLevel(batt_voltage);

  Serial.println("VOLTAGE:");
  Serial.println(batt_voltage);
  Serial.println("___________");
  Serial.println("PERCENTAGE:");
  Serial.println(batt_percentage);
  Serial.println("___________");

  delay(1500);
  ctrlBarGraph(arr_bargraph, batt_percentage);
}

void ctrlBarGraph(const e_PIN_BARGRAPH t_bargraph_arr[], uint8 t_batt_percentage)
{
  
}

uint8 compBatteryLevel(flt32 t_batt_voltage)
{
  flt32 l_res = mapFlt(t_batt_voltage, BOUNDARY_VOLTAGE_LEFT, BOUNDARY_VOLTAGE_RIGHT, 
                                       BOUNDARY_PERCENT_LEFT, BOUNDARY_PERCENT_RIGHT);
  return static_cast<uint8>(l_res);
}

inline flt32 mapFlt(flt32 t_val, flt32 t_inMin, flt32 t_inMax, flt32 t_outMin, flt32 t_outMax)
{
  return (t_val -  t_inMin) * (t_outMax - t_outMin) / (t_inMax - t_inMin) + t_outMin; 
}